Year	% of total labor force
1991	32.338920866552954
1992	32.44948811376645
1993	32.575273871487205
1994	32.739046233188176
1995	32.95639356640993
1996	33.08556656711198
1997	33.2712292893399
1998	33.489239224127154
1999	33.70849750986935
2000	33.916211719792486
2001	34.06704817556967
2002	34.21648122066136
2003	34.36512629374639
2004	34.505982765018764
2005	34.63132272085092
2006	34.707173285208725
2007	35.15017965192017
2008	35.60931699007241
2009	36.08378233095396
2010	36.57618668583099
2011	37.083570321733724
2012	37.607506329404586
2013	38.15204825157759
2014	38.70099301375039
2015	39.248994284947976
2016	40.489914911887425
2017	40.35934748412892
2018	39.18964466830068
2019	38.58930127378611
2020	38.5506584589806
2021	38.92035300056689
2022	38.65776766012493
2023	38.73175595530204